Most supporters of the law, however, use more nuanced arguments that depend on assumptions that are increasingly impossible to defend.

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The giant retailer argues that it is impossible to defend the case, since promotion and dismissal decisions are made on an individual basis.

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Following either of those strategies will force your opponent to block, setting you up to play a square that will give you two rows with which to get tic-tac-toe, impossible to defend.

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"It's true that it's impossible to completely defend against denial of service attacks and still be accessible, " says Marcus Ranum, chief security officer of Tenable Security.

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With every gully an almost impenetrable trench, and every boulder a bomb-proof bunker, it is very easy to defend and almost impossible to advance through.

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While it was possible - just - for the Conservatives to admit defeat in 1992 and leave the ERM, it has become impossible for European and US politicians to defend anything other than the brittle front line of globalisation.

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They likely would have taught him how to defend himself while also giving him reason to do so (although it's impossible to imagine any boy named Egbert not learning self-defense right away).

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As a result, it is impossible to rival the Super Bowl if you are trying to launch a new brand, build an established brand or defend a strong brand.

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